Steering column for vehicle

Abstract

Disclosed is a steering column for a vehicle. A steering column for a vehicle according to an embodiment of the present invention includes a housing provided in a vehicle and having an opening formed at one side thereof, a hollow shaft installed in the housing and configured to be movable in an axial direction through the opening of the housing, a roller having an outer peripheral surface configured to press an outer peripheral portion of the hollow shaft, an actuator configured to provide driving power for rotating the roller, and a first shaft configured to rotate relative to the hollow shaft and installed in the hollow shaft so as to be movable together with the hollow shaft, in which when the roller rotates, the hollow shaft and the first shaft are moved by a frictional force generated between the hollow shaft and the roller.

What is claimed is: 
     
       1. A steering column for a vehicle, the steering column comprising:
 a housing provided in a vehicle and having an opening formed at one side thereof; 
 a hollow shaft installed in the housing and configured to be movable in an axial direction through the opening of the housing; 
 a roller having an outer peripheral surface configured to press an outer peripheral portion of the hollow shaft; 
 an actuator configured to provide driving power for rotating the roller; and 
 a first shaft configured to rotate relative to the hollow shaft and installed in the hollow shaft so as to be movable together with the hollow shaft, 
 wherein when the roller rotates, the hollow shaft and the first shaft are moved by a frictional force generated between the hollow shaft and the roller. 
 
     
     
       2. The steering column of  claim 1 , further comprising:
 a support member configured to press an outer peripheral surface of the hollow shaft to support the hollow shaft. 
 
     
     
       3. The steering column of  claim 2 , wherein the support member is disposed opposite to the roller based on the hollow shaft. 
     
     
       4. The steering column of  claim 3 , wherein the support member is provided in plural. 
     
     
       5. The steering column of  claim 4 , wherein the plurality of support members comprise first and second support members arranged in the axial direction. 
     
     
       6. The steering column of  claim 5 , wherein the first and second support members are respectively disposed at front and rear sides based on the roller when viewed in the axial direction. 
     
     
       7. The steering column of  claim 2 , wherein the support member comprises:
 a slip bushing configured to support the hollow shaft; and 
 an elastic member configured to provide an elastic force that allows the slip bushing to support the hollow shaft. 
 
     
     
       8. The steering column of  claim 1 , wherein a through-hole is formed in the axial direction in the housing, at least a part of the hollow shaft is accommodated in the housing, and the roller presses the hollow shaft through the through-hole. 
     
     
       9. The steering column of  claim 1 , wherein a rotation shaft of the roller and the first shaft are disposed to be perpendicular to each other. 
     
     
       10. The steering column of  claim 1 , wherein a friction member is provided on the outer peripheral surface of the roller. 
     
     
       11. The steering column of  claim 1 , wherein a groove is formed in the outer peripheral surface of the roller and corresponds to an outer peripheral surface of the hollow shaft. 
     
     
       12. The steering column of  claim 1 , further comprising:
 a transmission configured to connect the actuator and the roller. 
 
     
     
       13. The steering column of  claim 1 , wherein a bearing is provided between the first shaft and the hollow shaft. 
     
     
       14. The steering column of  claim 1 , further comprising:
 a second shaft coupled to one end of the first shaft by a spline structure. 
 
     
     
       15. A steering column for a vehicle, the steering column comprising:
 a housing provided in a vehicle and having an opening formed at one side thereof; 
 a hollow shaft installed in the housing, configured to be movable in an axial direction through the opening of the housing, and having a first gear formed in the axial direction on an outer peripheral surface thereof; 
 a second gear coupled to the first gear; 
 an actuator configured to provide driving power for rotating the second gear; and 
 a first shaft configured to rotate relative to the hollow shaft and installed in the hollow shaft so as to be movable together with the hollow shaft, 
 wherein when the second gear rotates, the hollow shaft and the first shaft are moved by the first gear coupled to the second gear. 
 
     
     
       16. A steering column for a vehicle, the steering column comprising:
 a housing provided in a vehicle and having an opening formed at one side thereof; 
 a hollow shaft installed in the housing, configured to be movable in an axial direction through the opening of the housing, and having a pressing part formed in the axial direction at one side thereof; 
 a roller having an outer peripheral surface configured to press the pressing part of the hollow shaft; 
 an actuator configured to provide driving power for rotating the roller; and 
 a first shaft configured to rotate relative to the hollow shaft and installed in the hollow shaft so as to be movable together with the hollow shaft, 
 wherein when the roller rotates, the hollow shaft and the first shaft are moved by a frictional force generated between the roller and the pressing part of the hollow shaft.